/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.spark.sql.hive.execution;

import org.apache.hadoop.hive.ql.exec.UDF;

import java.util.List;

public class UDFListListInt extends UDF {
  /**
   *
   * @param obj
   *   SQL schema: array<struct<x: int, y: int, z: int>>
   *   Java Type: List<List<Integer>>
   * @return
   */
  public long evaluate(Object obj) {
    if (obj == null) {
      return 0l;
    }
    List<List> listList = (List<List>) obj;
    long retVal = 0;
    for (List aList : listList) {
      @SuppressWarnings("unchecked")
      List<Object> list = (List<Object>) aList;
      @SuppressWarnings("unchecked")
      Integer someInt = (Integer) list.get(1);
      try {
        retVal += (long) (someInt.intValue());
      } catch (NullPointerException e) {
        System.out.println(e);
      }
    }
    return retVal;
  }
}
